title: Impedance spectra of polypyrrole coated platinum electrodes.
abstract: Polypyrrole (PPy) coated electrodes may provide new solutions to increase the charge injection capacity and biocompatibility of metal electrodes in e.g., neural stimulus applications. In this study, electrical impedance spectra of PPy coated platinum (Pt) electrodes having three different coating thicknesses were measured and modeled. A suitable equivalent electrical circuit providing the material characteristics was chosen and the impedance data was analyzed using the model and data fitting. The modeled parameter values of different coating thicknesses were compared and our results demonstrated the changes in charge transfer properties and mechanisms of thin and thick PPy film coatings.
authors.forename: Niina
authors.initials: N
authors.lastname: Onnela
authors.forename: Virpi
authors.initials: V
authors.lastname: Savolainen
authors.forename: Maiju
authors.initials: M
authors.lastname: Hiltunen
authors.forename: Minna
authors.initials: M
authors.lastname: Kellomäki
authors.forename: Jari
authors.initials: J
authors.lastname: Hyttinen
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D017097:Electric Impedance; D004566:Electrodes; D004581:Electronics; D018625:Microscopy, Atomic Force; D010984:Platinum / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; D010984:Platinum